
def search4vowels(phrase:str) -> set:
    """Display any vowels found in a supplied phrase."""
    vowels = set('aeiou');
    return vowels.intersection(set(phrase))


def search4letters(phrase:str, letters:str='aeiou') -> set:
    """Return a set of the 'letter' found in 'phrase'."""
    return set(letters).intersection(set(phrase))
